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net/tls: Fix kmap usage 

[ Upstream commit b06c19d9f827f6743122795570bfc0c72db482b0 ]

When MSG_OOB is specified to tls_device_sendpage() the mapped page is
never unmapped.

Hold off mapping the page until after the flags are checked and the page
is actually needed.

Fixes: e8f6979981 ("net/tls: Add generic NIC offload infrastructure")
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
zero-colors
Ira Weiny 2020-08-10 17:02:58 -07:00 committed by Greg Kroah-Hartman
parent 7bedf1d862
commit 49a5b473bc
1 changed files with 2 additions and 1 deletions
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3
net/tls/tls_device.c
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@ -549,7 +549,7 @@ int tls_device_sendpage(struct sock *sk, struct page *page,
{
struct tls_context *tls_ctx = tls_get_ctx(sk);
struct iov_iter msg_iter;
char *kaddr = kmap(page);
char *kaddr;
struct kvec iov;
int rc;
@ -564,6 +564,7 @@ int tls_device_sendpage(struct sock *sk, struct page *page,
goto out;
}
kaddr = kmap(page);
iov.iov_base = kaddr + offset;
iov.iov_len = size;
iov_iter_kvec(&msg_iter, WRITE, &iov, 1, size);